Initialize collection listeners when the script loads after window load

[javihgil]

Problem

The package registers its bootstrap only through window.addEventListener('load', __init).

If the script is loaded after the window load event has already fired, initialization never runs.

Impact

• collection actions do not work in late-loaded bundles
• dynamic admin screens can fail silently
• integration depends on script timing instead of component state

Expected behavior

Initialization should also handle the case where the document is already loaded when the script is evaluated.